The extensive "Second lawsuit between Antonio Guamanyanac and Geronimo Caxayauri 1588" (AGN / Buenos Aires 9-45-5-15), studied by Espinoza Soriano (1983-84), throws light on friction between two kurakazgos of the Rímac River basin before, during, and after the Spanish invasion. This essay proposes that two brothers who figure in the lawsuit, both of them khipukamayuq (khipu masters) and kurakas, namely, Condorchagua and Pomachagua of Yaucha (resettlement of Huánchor), are the same persons as the Condor Chaua and Poma Chaua whom Guaman Poma drew as imperial khipukamayuq of Tawantinsuyu. This essay also focuses on D. Gerónimo Cancho Guaman, a witness in the 1588 lawsuit. He is the same person as the old kuraka of San Damián whose "idolatries" figure in chapter 20 of the anonymous Quechua manuscript of Huarochirí ([1608?] Taylor 1987). The lawsuit thus forms common ground between two main sources of Andean ethnohistorical tradition. The lawsuit clarifies interests and practices of the kuraka elite which have until now been overshadowed by the narrative works' ideological content.